487989 - http://www.javascript.su/ causes unusually high CPU usage while loading and scrolling up/down

Status: RESOLVED WORKSFORME

(Firefox :: General, defect)

Description

[Brian Carpenter [:geeknik]]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b4pre) Gecko/20090411 Shiretoko/3.5b4pre
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b4pre) Gecko/20090411 Shiretoko/3.5b4pre

While loading http://www.javascript.su/ I noticed that Firefox 3.5b4pre was using almost 100% of the CPU to load the page.  When I press Ctrl-F5 to refresh the page, CPU usage spikes to almost 100% as well. After the page is loaded 100%, if you scroll the page up or down, Firefox uses close to 100% of the CPU.

Reproducible: Always

Steps to Reproduce:
1. Open Firefox 
2. Visit http://www.javascript.su/
3. Watch firefox.exe in task manager use almost 100% of the CPU while page is loading or while scrolling the page up or down.
Actual Results:  
Firefox uses almost 100% of the CPU to load the page.  CPU usage is almost 100% while refreshing the page with Ctrl-F5 as well.  CPU usage is almost 100% while scrolling the page up or down.

Expected Results:  
Firefox shouldn't hog the CPU while the page is loading or while scrolling the page up or down.

Comment 1

[Brian Carpenter [:geeknik]]

Appears that this is fixed in the latest nightly build of Shiretoko.